MIT provides MULTICS source and documentation (DPS-8 simulation)

[der Mouse]

>> I really don't have a clue as to why you'd _want_ something like a
>> separate dedicated processor to handle I/O,
> I can't imagine why anyone *wouldn't* want such a thing.

It makes debugging substantially more difficult when the code is
scattered across multiple processors, especially if they're
heterogenous.

The hardware costs more.

(Yes, these are often outweighed by other considerations; I offer them
as possible answers to the question of why one might not want such a
thing.)

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